public function testBeanstalk()
 {
     $manager = new Manager();
     $beanstalk = new Beanstalk($manager);
     $this->assertNull($beanstalk->getDispatcher());
     $this->assertSame($manager, $beanstalk->getConnectionManager());
     $manager['default1'] = new Configuration('127.0.0.1', 12345);
     $manager['default2'] = new Configuration('127.0.0.1', 67890);
     $manager['default3'] = new Configuration('127.0.0.1', 99999);
     $producer = $beanstalk->getProducer('default2');
     $this->assertEquals($producer, $beanstalk->getProducer('default2'));
     $this->assertNotEquals($producer, $beanstalk->getProducer('default3'));
 }